Set tmux pane title to short hostname on ssh connections

set-tmux-title.sh

ssh() {
  # grep -w: match command names such as "tmux-2.1" or "tmux: server"
  if ps -p $$ -o ppid= \
    | xargs -i ps -p {} -o comm= \
    | grep -qw tmux; then
    # Note: Options without parameter were hardcoded,
    # in order to distinguish an option's parameter from the destination.
    #
    #                   s/[[:space:]]*\(\( | spaces before options
    #     \(-[46AaCfGgKkMNnqsTtVvXxYy]\)\| | option without parameter
    #                     \(-[^[:space:]]* | option
    # \([[:space:]]\+[^[:space:]]*\)\?\)\) | parameter
    #                      [[:space:]]*\)* | spaces between options
    #                        [[:space:]]\+ | spaces before destination
    #                \([^-][^[:space:]]*\) | destination
    #                                   .* | command
    #                                 /\6/ | replace with destination
    tmux rename-window "$(echo "$@" \
      | sed 's/[[:space:]]*\(\(\(-[46AaCfGgKkMNnqsTtVvXxYy]\)\|\(-[^[:space:]]*\([[:space:]]\+[^[:space:]]*\)\?\)\)[[:space:]]*\)*[[:space:]]\+\([^-][^[:space:]]*\).*/\6/')"
    command ssh "$@"
    tmux set-window-option automatic-rename "on" 1> /dev/null
  else
    command ssh "$@"
  fi
}